Ionic Liquid Catalyst Tuning Hydrocarbon Composition
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for regulating volatile organic compounds emissions and controlling ground-level ozone formation through gasoline reformulation face challenges, particularly with the need to remove C5 and C6 paraffins, and existing catalysts for paraffin disproportionation and isomerization require high temperatures or use hazardous substances, leading to inefficiencies and increased costs.
Innovation Solution
A process that tunes hydrocarbon product composition by selecting a range of paraffins, determining equilibrium constants, and reacting them with an ionic liquid catalyst to achieve desired product compositions, allowing for the control of product ratios and formation of valuable branched paraffins at lower temperatures and pressures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional catalysts (zeolites, sulfated zirconias, AlCl3/SiO2, platinum on Al2O3/Ga2O3) are used for paraffin disproportionation, then the desired transformation can be achieved, but elevated temperatures (120-450°C) are required which increase energy consumption and operational costs
Solution Approach 1:
The patent changes the physical and chemical parameters of the catalyst system by using ionic liquids with specific compositions (e.g., [BMIM][PF6], [HMIM][PF6]) and adding carbocation promoters (e.g., CF3COOH, HFIP) to enable disproportionation reactions at lower temperatures (50-150°C) while maintaining catalytic effectiveness
Solution Approach 2:
The patent creates a composite catalyst system combining ionic liquids with carbocation promoters, where the ionic liquid provides the catalytic framework and the carbocation promoter enhances the acidity and activity, enabling effective disproportionation at reduced temperatures
2Temperature
If HF/TiF4 system is used for disproportionation, then reactions can proceed at low temperature (51°C), but dangerous HF is utilized which increases safety risks and environmental harm
Solution Approach 1:
The patent replaces the hazardous but effective HF/TiF4 system with ionic liquids that can be used in smaller quantities and potentially regenerated, reducing the need for large amounts of dangerous materials while maintaining low-temperature operation
Solution Approach 2:
The patent converts the harmful effect of strong acidity (originally provided by HF) into a beneficial catalytic effect by using carbocation promoters in ionic liquid systems, achieving the same low-temperature operation without the safety hazards of HF
3Reliability
If supported ionic liquid catalysts are used, then catalytic activity can be maintained, but the support increases catalyst cost and may result in chemical reactions between support and acidic ionic liquid over time
Solution Approach 1:
The patent extracts and eliminates the support component from the catalyst system, using standalone ionic liquids with carbocation promoters that provide all necessary catalytic functions without requiring additional support materials, thereby reducing complexity and cost
4Object-affected harmful factors
If C5 and C6 paraffins are removed from gasoline pool to meet emissions regulations, then volatile organic compounds emissions are controlled, but refiners become oversupplied with C5 and C6 paraffins creating a new problem
Solution Approach 1:
The patent changes the carbon number distribution parameter of the hydrocarbon feed by using disproportionation reactions that convert excess C5/C6 paraffins into lighter (C1-C4) and heavier (C7+) products, thereby balancing the product slate and eliminating the oversupply problem while maintaining emissions compliance
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This process enables the efficient production of desired hydrocarbon products with improved octane numbers and vapor pressure, allowing refiners to adjust product mixes based on market demands and maximize the use of lower-value feeds, while reducing catalyst costs and environmental impact.
Implementation Method 1
Disproportionation reactions offer a possible solution to this problem. The disproportionation of paraffins (e.g., isopentane (iC5)) involves reacting two moles of hydrocarbon to form one mole each of two different products
Implementation Method 2
The liquid catalyst comprises an ionic liquid and a carbocation promoter
Data Source
AI summary
A process of tuning a hydrocarbon product composition is described. The process involves selecting paraffins for reaction. The equilibrium constants for reactions of the selected paraffins can be used to select appropriate feed ratios, or an equilibrium composition as function of C/H molar ratio. A selected feed is reacted to obtain the product. Equilibrium product compositions and non-equilibrium product compositions can be obtained using the process.